As the high school football season enters its last week of the regular season, four league crowns are up for grabs.

One league in particular has so many postseason possibilities it brings on a headache faster than an IRS audit.

Here’s a closer look at those leagues and what it’ll mean when the CIF-Southern Section pairings are released Sunday:

RIO HONDO LEAGUE

There could be a three-way tie for first at 4-1 if Temple City (5-4, 3-1) beats La Ca ada (4-5, 2-2) and San Marino (8-1, 3-1) beats Monrovia (7-2, 4-0).

A coin flip determines the final league placement.

There also could be a three-way tie for second.

The Wildcats can clinch the title outright with a win over the Titans. If the Spartans upend the Rams, that leaves them both at 3-2 and three teams will fight for two guaranteed playoff spots.

In that event, a coin flip among the three teams will determine the second-place team, and the two remaining teams will meet Saturday morning at a neutral site and have a playoff, better known as the “California tiebreaker.”

Temple City could be left out if it loses to La Ca ada and San Marino beats Monrovia for a share of the title. The Titans would earn the No. 1 spot and the Wildcats would fall to No. 2 after the head-to-head tiebreaker.

The Rams and Spartans would tie for third at 3-2, but Temple City is the odd team out because the first tiebreaker is head-to-head competition, thus allowing the Spartans to advance in that scenario.

ALPHA LEAGUE

Maranatha (9-0, 4-0) will need a win against Brentwood (8-1, 4-0) if it is to not only clinch the league title but also secure a No. 2 seeding in the East Valley Division. Brentwood is ranked No. 3 in the division.

MISSION LEAGUE

St. Francis (6-3, 1-1) got an unfortunate break last week when it had a 53-yard fumble return negated by a questionable call. The Golden Knights lost, 24-21, to Alemany (8-1, 2-0).

Despite the unfortunate turn of events, St. Francis still has a chance to clinch at least a share of the league title with a win over Chaminade (1-8, 0-2) combined with a St. Paul (4-5, 1-1) win over Alemany.

That would create a tri-league champion scenario with the possibility of only two teams advancing to the playoffs. A coin flip would determine who gets to represent the league as the No. 1 team.

In the event the Western Division doesn’t give the Mission League an at-large berth, the third team could be left out of the playoffs.

In the latest divisional rankings, Alemany is ranked No. 2, St. Francis is No. 6 and St. Paul is No. 9.

PREP LEAGUE

Rio Hondo Prep’s (5-3, 3-1) confidence was shaken with close losses to Brentwood (28-26) and Maranatha (14-7) early in the season.

Losing the league opener to Chadwick didn’t help, either.

But it’s been easy since then for the Kares, who came away with plenty of learning experience from the early losses.

Rio Hondo Prep’s Antonio Alaniz and Tim Esguerra have proven to be trouble for opposing defenses.

Flintridge Prep (3-5, 3-1) got its act together when league started but will need to contain Alaniz and Esguerra if it is to stay within striking distance for a shot at the title. The teams meet Friday at 7 at Occidental College.

MONTVIEW LEAGUE

After a rough start, Duarte (4-5, 4-1) possibly could finish as co-champion. But they’ll need a lot of help to get there.

A victory won’t be enough for the Falcons, who face La Puente (1-8, 1-4). They’ll also need Azusa (8-1, 5-0) to drop one to Bassett (1-8, 0-5).

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